Phase-dependant photochemistry of TiO2 nanoparticles in the degradation of organic dye methylene blue under solar light irradiation

Prasannalakshmi, P.; Shanmugam, N.

doi:10.1007/s00339-017-1191-z

Cited by 6 publications

(7 citation statements)

References 25 publications

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“…This implies that the photocatalytic efficiency was increased with the ratio of anatase/rutile TiO 2 , revealing the distinctive photocatalytic activity of anatase TiO 2 NPs against its rutile phase. Similar results have been reported for the photocatalytic degradation of MB using UV and solar light [18,31,32]. It is noteworthy that the band gap energy of anatase and rutile phase is 3.21 and 3.00 eV, respectively, with similar absorbance at higher photon energy [33], implying that the different crystalline phases of TiO 2 should absorb similar number of photons from the 365-nm light excitation (3.39 eV).…”

Section: Photocatalytic Activitysupporting

confidence: 80%

“…2 NPs (anatase/rutile mixture 9:1) showed the strongest degradation of MB, implying the highest photocatalytic activity, followed by NPs with anatase/rutile mixture of 0.33:1, 0.25:1, 0.11:1, and 0.08:1, respectively. This result suggested that the photocatalytic activity decreases with the reduction of anatase content in the mixture, implying that anatase TiO 2 NPs was more efficient for MB degradation, when compared to the rutile phase, as highlighted in literature [18,28]. Considering that the morphology, percentage of elements, and particle size should be the same for the anatase and rutile TiO 2 NPs [28,29].…”

Section: Photocatalytic Activitymentioning

confidence: 55%

“…The surface properties, particularly the orientation and coordination structure of surfaces of the different TiO 2 polymorph, which play a role in the adsorption and subsequent charge transfer to the dyes, can therefore be considered to contribute to the distinct photocatalytic activities of TiO 2 NPs. Therefore, the possible degradation process of MB should involve OH• free radical on the surface of TiO 2 NPs, when their electron gets excited from the valence to the conduction band under the UV light excitation and the electron in the conduction band reduces the dissolved oxygen [17,18,33]. Then, the OH• induces N-demethylation reaction of MB, leading to its degradation into H 2 O, CO 2 , and other organic molecules [34,35].…”

Section: Photocatalytic Activitymentioning

confidence: 99%

“…Their band gap energy is in the UV or visible light region, thus, even sunlight could excite electrons from the valence band to the conduction band, making this method an inexpensive option [11][12][13][14]. Amongst many semiconductor nanomaterials, titanium dioxide nanoparticles (TiO 2 NPs) has been extensively investigated for environmental remediation applications [15][16][17][18][19]. The advantages of TiO 2 NPs as photocatalyst is supported by its chemical stability, distinct oxidation strength, low toxicity, low pollutant load, and availability at low-cost [20].…”

Section: Introductionmentioning

confidence: 99%

“…The particle size has been proven to be the key factor of the photocatalytic activity of TiO 2 NPs [17]. Another important factor is the crystalline phase of TiO 2 NPs which can be attributed to phase-dependent Brunauer-Emmett-Teller (BET) surface area, pore size, and charge transfer resistance [18].…”

Section: Introductionmentioning

confidence: 99%

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Sol-gel Preparation of Different Crystalline Phases of TiO<SUB>2</SUB> Nanoparticles for Photocatalytic Degradation of Methylene Blue in Aqueous Solution

Zulmajdi¹,

Zamri²,

Mahadi³

et al. 2019

AJN

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This paper describes the photocatalytic degradation of methylene blue (MB) in aqueous solution in the presence of TiO 2 nanoparticles (NPs) in different compositions of anatase and rutile phases under UV light irradiation. The different compositions of crystalline phases of TiO 2 NPs were synthesized using sol-gel method at the same temperature for various calcination times. The TiO 2 NPs were subjected to crystal phase, vibrational, size, and morphological characterizations. The photocatalytic degradation of MB revealed that anatase TiO 2 NPs have a superior catalytic activity in the front of rutile phase. This finding further suggested that low charge resistance and low electron-hole recombination probability lead to the acceleration of the OH• formation on the surface of anatase TiO 2 NPs.

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Section: Photocatalytic Activitysupporting

confidence: 80%

Section: Photocatalytic Activitymentioning

confidence: 55%

Section: Photocatalytic Activitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sol-gel Preparation of Different Crystalline Phases of TiO<SUB>2</SUB> Nanoparticles for Photocatalytic Degradation of Methylene Blue in Aqueous Solution

Zulmajdi¹,

Zamri²,

Mahadi³

et al. 2019

AJN

View full text Add to dashboard Cite

show abstract

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Uddin

Zhang

et al. 2020

Advanced Materials

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The structure–property engineering of phase‐based materials for redox‐reactive energy conversion and environmental decontamination nanosystems, which are crucial for achieving feasible and sustainable energy and environment treatment technology, is discussed. An exhaustive overview of redox reaction processes, including electrocatalysis, photocatalysis, and photoelectrocatalysis, is given. Through examples of applications of these redox reactions, how structural phase engineering (SPE) strategies can influence the catalytic activity, selectivity, and stability is constructively reviewed and discussed. As observed, to date, much progress has been made in SPE to improve catalytic redox reactions. However, a number of highly intriguing, unresolved issues remain to be discussed, including solar photon‐to‐exciton conversion efficiency, exciton dissociation into active reductive/oxidative electrons/holes, dual‐ and multiphase junctions, selective adsorption/desorption, performance stability, sustainability, etc. To conclude, key challenges and prospects with SPE‐assisted redox reaction systems are highlighted, where further development for the advanced engineering of phase‐based materials will accelerate the sustainable (active, reliable, and scalable) production of valuable chemicals and energy, as well as facilitate environmental treatment.

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Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Marfur

Jaafar

2021

J Chinese Chemical Soc

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The impact of different light irradiation was studied on photocatalytic degradation of 2‐chlorophenol (2‐CP) using mesoporous titania nanoparticles (MTNs) prepared by microwave‐assisted methods. The photoactivity of MTNs was also compared with pretreated commercial TiO2 and Degussa P25 (P25). The reactions were conducted for 2.5 hr under UV‐A, UV‐C, sunlight, and visible light using a batch reactor. The catalysts were characterized by X‐ray powder diffractometer, UV–Vis diffuse reflectance spectroscopy, photoluminescence, Brunauer–Emmett–Teller method, field‐emission scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. The characterization results confirmed that MTN consisted a composition of 21% rutile phase and 79% anatase phase with Ti3+ site defects (TSDs) and oxygen vacancies (OVs) in their structures because of their anionic surfactant nature, microwave heating, and high calcination temperature during the catalyst preparation. Besides, the photoactivity of MTN upon degradation of 2‐CP under sunlight has exhibited the best performance with 100% degradation followed by UV‐A, visible light, and UV‐C with degradation of 96, 52, and 39%, respectively. MTNs showed a remarkable performance due to their mixed‐phase crystalline structures as well as the formation of TSDs and OVs, which improved the charge migration, lowered the band gap energy, and reduced the rate of electron–hole recombination, thus succeeded to be activated under a wide range of light responses.

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Phase-dependant photochemistry of TiO2 nanoparticles in the degradation of organic dye methylene blue under solar light irradiation

Cited by 6 publications

References 25 publications

Sol-gel Preparation of Different Crystalline Phases of TiO<SUB>2</SUB> Nanoparticles for Photocatalytic Degradation of Methylene Blue in Aqueous Solution

Sol-gel Preparation of Different Crystalline Phases of TiO<SUB>2</SUB> Nanoparticles for Photocatalytic Degradation of Methylene Blue in Aqueous Solution

Structural‐Phase Catalytic Redox Reactions in Energy and Environmental Applications

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

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